The Pats signed McClellin to a three-year deal prior to the 2016 season, but that was the only season in which he played for the team. McClellin missed all of last season due to injury. Prior to coming to New England, McClellin played four seasons with the Bears, who chose him 19th overall in 2012.

McClellin's biggest contribution with the Pats came when he blocked a Justin Tucker kick in Week 14 of the 2016 season against the Ravens.